Different forms of energy - class-XI
| Description: different forms of energy | |
| Number of Questions: 88 | |
| Created by: Ankita Patil | |
| Tags: work, energy and power energy transformations and energy transfers the essence of change physics |
A helicopter takes off from the ground and rises vertically. It then hovers at a constant height
above the ground.
Which sequence of energy changes takes place during the gain in height?
The plants trap solar energy in the form of :
Identify the energy changes in the following cases
$A$: A car moving up a hill.
$B$: Photographic film is exposed to sun-light.
What are the various energy transformations that occur when you are riding a bicycle ?
A ball falls freely under gravity from rest. Name the kind of energy it will possess on reaching the ground.
As the water stored in the reservoir of a dam flows out, its potential energy changes to :
A battery lights a bulb. The electric energy on flowing through the filament of the bulb, first changes into ______ energy and then into the _______ energy.
A metal ball of mass $2kg$ is allowed to fall freely from rest from a height of $5m$ above the ground (Take $g=10ms^{-2}$). After the ball hits the ground and comes to rest, mechanical energy is converted to:
State whether the given statement is True or False :
Iron glows in red colour when it is heated to very high temperature because:
A moving coin hits another coin and sets it into motion.In this case energy from the moving coin is ---- to the other coin:
When a stone is thrown upwards:
In which of the following, chemical energy is converted into heat energy?
Which of the following statement is NOT true?
In steam engine:
A tube light converts electrical energy into :
The device / machine which converts chemical energy into electrical energy is
Which of the following statements is correct?
A solar water heater converts
The temperature of water at the bottom of a waterfall is higher than that of the water at the top, because:
Burning of a meteorite in the earth's atmosphere is an example of change of :
When fuels are burnt, chemical energy changes into:
A ball is placed on a compressed spring. On releasing the spring, the ball flies away. Then which of the following is true?
Which of the following devices converts electrical energy into heat energy?
Buming of a meteorite in the Earth's atmosphere is an example of change of:
A generator is an arrangement which converts _________ energy into _________ energy.
A motor converts:
In which of the following chemical energy is converted into heat energy?
During photosynthesis, green plants convert:
Which of the following devices convert light energy into electrical energy?
Which of the following devices does not convert electrical energy into sound energy?
A battery, left idle (i.e., not in use):
A running car converts:
By charging a battery, we convert electrical energy into
A loud speaker converts:
In the moving parts of a machine:
A thermocouple converts:
What are the various energy transformations that occur when you are riding bicycle?
If $1kg$ of a substance is fully converted into energy , then the energy produced is
An anti-aircraft shell has been fired and it has a kinetic energy x. It explodes in the air. Then the sum of kinetic energies of all the particles is:
In a hydroelectric power plant more electrical power can be generated if water falls from a greater height because
Choose the incorrect statement regarding wind power.
Water falls from a height 500 m. What is the rise in temperature of water at bottom if whole energy remains in the water?
When we rub our hands, which of the following is true?
A body off mass $5kg$ falls from a height of $30metre$. If its all mechanical energy is changed into heat, then heat produced will be
a piece of lead falls from a height of $100m$ on a fixed non-conducting slab which brings it to rest. If the specific heat of lead is $30.6{\rm{ }}cal/kg{\,^ \circ }C,$, the increase in temperature of the slab immediately after collision is
A metal ring of mass 2.1 kg and of 10 cm radius is revolving about its axis, Making 100/$\pi $ revoluation/s in the liquid is equal to
The temperature inside and outside a refrigerator are $273\ K$ and $300\ K$ respectively Assuming that the refrigerator cycle is reversible, for every joule of work done, the heat delivered to the surrounding will be nearly
The height of the Niagara falls is $50$ metres, $(1 cal= 4.2 \mathrm\ { J }).$ Assume its mechanical energy can be completely converted into heat energy.
The units of fore and length are made three times of their earlier values. Earlier the energy of a system was $81\ J$. What will be the energy of the same system in new units?
When $1\ gm$. of water at $100^{\circ}C$ is converted into steam occupies $1671\ c.c.$ The amount of work done in converting water into steam is
$1$ calorie is the heat required to increase the temperature of $1g$ of water by $1 ^ { \circ } \mathrm { C }$ from:
If the amount of heat given to a system is $35\, J$ and the amount of work done on the system is $15\, J$, then the change in internal energy of the system is
A geyser heats water flowing at the rate of 3.0 liters per minute from ${ 27 }^{ \circ }C$ to ${ 77 }^{ \circ }C$. If the geyser operates on a gas burner, the rate of consumption of the fuel if its heat of combustion is $4.0\times { 10 }^{ 4 }J/g$ per minute is
A certain quantity of heat energy is given to a diatomic ideal gas which expands at constant pressure. The fraction of the heat energy that is converted into work is
A hammer of mass 1$\mathrm { kg }$ having speed of 50$\mathrm { m } / \mathrm { s }$ , hit a iron nail of mass 200$\mathrm { gm }$ . If specific heat of iron is 0.105 cal/gm'C and half the energy is converted into heat, the raise in temperature of nail is
In case of explosion of a bomb which of the following does not change?
In the foregoing question, the amount of energy given to the system from A to B is:
The specific heat capacity of a metal at low temperautre (T) is given as $C _ { p } \left( k \sqrt { k } - 1 k g ^ { - 1 } \right) = 32 \left( \frac { T } { 400 } \right) ^ { 3 }$ A 100 gram vessel of this metal is to be cooled from $20 ^ { \circ } K$ to $4 ^ { \circ } \mathrm { K }$ by a special refrigerator operating at room temperature $\left( 27 ^ { \circ } \mathrm { C } \right) .$ The amount of work required to cool the vessel is:-
An ideal gas heat engine operates in a Carnot's cycle between $227^{\circ}C$ and $127^{\circ}C$. It absorbs $6\times 10^{4} J$ at high temperature. The amount of heat converted into work is _____.
Work done by 100 calorie of heat is __________.
A person of weight 60 kg wants to loose 5 kg by going up and down 10m high stairs. Assume he burns twice as much fat while going up than going down. If 1 kg of fat is burnt on expending 7000 kcal. How many times must he go up and down to reduce his 7 kg weight? (Take $ g=10 \mathrm{ms}^{-2} ) $
What is $\Delta E$ for a system that does 5 kcal of work by the surroundings when 3 kcal heat is absorbed by the system.
A bullet of mass 10 gm moving with a speed of 20 m/s hits an ice block of mass 990 gm kept on a frictionless floor and gets stuck in it. The amount of ice that melts, if 50% of the lost kinetic energy goes to ice, will be
A steel ball of mass $5$ ${ g }$ is thrown downward with velocity $10$ ${ ms } ^ { - 1 }$ from height $19.5$ ${ m }$ . It penetrates sand by $50$ ${ cm }$ . The change in mechanical energy will be ( ${ g } = 10$ ${ ms } ^ { - 2 }$ )
A block of ice falls from certain height and completely melts. If only 3/4th of the energy is absorbed by the block the height of fall should be
A block of ice at 0 C whose mass is initially 50.0 kg slides along a horizontal surface starting at a speed of 5.38 m/s and finally coming of ice melted as a result of the friction between the block and the surface will be
An ice block is falling from a height. If $75\%$ of the block melts then $h = (g = 10\ ms^{-2})$.
A block of mass 500Kg has dimension $10 \times 5 \times 2m$. It is placed on a table with the largest surface in contract. The work that must be done to turn it an place it so that the smallest surface is in contact with the table
A lead ball moving with velocity v strikes a wall and stops. I 50% of its energy is converted into heat, then what will b the increase in temperature? (Specific heat of lead is s)
In an energy recycling process, $x _ { g }$ of steam at $100 ^ { \circ } C$ becomes water at $100 ^ { \circ } \mathrm { C }$ which converts $\mathrm { Yg }$ of ice at $0 ^ { \circ } \mathrm { C }$ into water at $100 ^ { \circ } \mathrm { C }$ . The ratio XY will be
$4180 J$ of work raises the temperature of $1$ litre water through:-
The work done on the particle of mass m by a force $ \overrightarrow { F } =K\left[ \frac { X }{ \left( X^ 2+y^ 2 \right)^{1/2} } \hat { i } +\frac { y }{ \left( X^ 2+y^ 2 \right)^{1/2} } \hat { j } \right] $ (k being a constant of appropriate simensions), when the particle is taken from the point (a,0) to the point (0,a) along a circular path of radius a about the origin in the X-y plane
The maximum amount of work that can be done by extracting $1J$ of energy from a body at $127^oC$ with an environment at $27^oC$?
Which of the following energy conversions take place in a torch?
The glow worm produces light energy from
A fast moving motorbike mainly converts _______ energy to kinetic energy.
A tube light converts electrical energy into heat energy
An electric heater is used by us to convert electrical energy to:
A plant usually stores its carbohydrates in its fruits. This process also shows the conversion of _______ energy to _______ energy.
A Wind-mill converts mechanical energy to ________ energy
A cyclist free-wheels from the top of a hill, gathers speed going down the hill, apply his brakes and eventually came to rest at the bottom of the hill. Which one of the following energy changes take place?
The temperature of water at the bottom of a large waterfall is generally higher than that of the water at the top, because
The temperature of water at the bottom of a waterfall is higher than that ofthe water at the top, because
A pendulum rocks back and forth. In an ideal setting, this motion would go on perpetually without loss of mechanical energy. Realistically, if you held a pendulum up and made it go in motion, it would slow to a stop.
What is responsible for the pendulum gradually losing mechanical energy? Ignore the mass of the string holding the pendulum bob in motion.
The correct sequence of energy changes in hydroelectric power station is:
Electric heater converts :
The height of water in a dam reduces by $20 m$, which is used to generate electricity. The water further fell by $10 m$ into the tunnel to strike the turbine plates. If the volume of water is ${10}^{4} {m}^{3}$, find the hydel energy generated. Assume all the potential energy of the water being converted into electricity. Take $g = 10 m{s}^{-2}$.